Struct Pair

pub struct Pair<R> { /* private fields */ }

A matching pair of Tokens and everything between them.

A matching Token pair is formed by a Token::Start and a subsequent Token::End with the same Rule, with the condition that all Tokens between them can form such pairs as well. This is similar to the brace matching problem in editors.

Implementations

impl<R: RuleType> Pair<R>

pub fn as_rule(&self) -> R

Returns the Rule of the Pair.

Examples

enum Rule {
    a
}

let input: Arc<str> = Arc::from("");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_rule(), Rule::a);

Examples found in repository

examples/parens.rs (line 58)

fn expr(pairs: Pairs<Rule>) -> Vec<Paren> {
    pairs
        .filter(|p| p.as_rule() == Rule::paren)
        .map(|p| Paren(expr(p.into_inner())))
        .collect()
}

pub fn as_str(&self) -> &str

Captures a slice from the &str defined by the token Pair.

Examples

enum Rule {
    ab
}

let input: Arc<str> = Arc::from("ab");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_str(), "ab");

pub fn into_span(self) -> Span

👎Deprecated since 2.0.0: Please use as_span instead

Returns the Span defined by the Pair, consuming it.

Examples

enum Rule {
    ab
}

let input: Arc<str> = Arc::from("ab");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.into_span().as_str(), "ab");

pub fn as_span(&self) -> Span

Returns the Span defined by the Pair, without consuming it.

Examples

enum Rule {
    ab
}

let input: Arc<str> = Arc::from("ab");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::ab ...
}).unwrap().next().unwrap();

assert_eq!(pair.as_span().as_str(), "ab");

pub fn into_inner(self) -> Pairs<R>

Returns the inner Pairs between the Pair, consuming it.

Examples

enum Rule {
    a
}

let input: Arc<str> = Arc::from("");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();

assert!(pair.into_inner().next().is_none());

Examples found in repository

examples/parens.rs (line 59)

fn expr(pairs: Pairs<Rule>) -> Vec<Paren> {
    pairs
        .filter(|p| p.as_rule() == Rule::paren)
        .map(|p| Paren(expr(p.into_inner())))
        .collect()
}

pub fn tokens(self) -> Tokens<R>

Returns the Tokens for the Pair.

Examples

enum Rule {
    a
}

let input: Arc<str> = Arc::from("");
let pair = pest::state(input, |state| {
    // generating Token pair with Rule::a ...
}).unwrap().next().unwrap();
let tokens: Vec<_> = pair.tokens().collect();

assert_eq!(tokens.len(), 2);

Trait Implementations

impl<R: Clone> Clone for Pair<R>

fn clone(&self) -> Pair<R>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<R: RuleType> Debug for Pair<R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<R: RuleType> Display for Pair<R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<R: Hash> Hash for Pair<R>

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<R: PartialEq> PartialEq for Pair<R>

fn eq(&self, other: &Pair<R>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<R: Eq> Eq for Pair<R>